Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007sf2a.conf...65s&link_type=abstract
SF2A-2007: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics held in Grenoble, France, July
Astronomy and Astrophysics
Astrophysics
Scientific paper
The VLT Planet Finder SPHERE (Spectro-Polarimetric High-contrast Exoplanet REsearch), that will include extreme adaptative optics (AO) and high-contrast coronagraphy, is under development. While observing exoplanets with one of the facilities of SPHERE --IRDIS (Infra-Red Dual-beam Imaging and Spectroscopy) in stabilized pupil mode-- the field of interest rotates in the focal plane with respect to optical aberrations that arise from post-AO residuals and instrumental aberrations. We propose a detection-estimation algorithm, based on a likelihood approach, where we use this rotation effect as the main discriminating criterium between the planet and the speckles. We also propose an idea to extend the algorithm in order to take into account the Double Band Imaging facility given by IRDIS. The performance of the algorithm is evaluated by numerical simulations based on the code developped within the SPHERE consortium.
Boccaletti Anthony
Carbillet Marcel
Dohlen Kj.
Ferrari Aldo
Fusco Th.
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